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首页> 外文期刊>Journal of Earthquake Engineering >SEISMIC BEHAVIOUR OF PERIMETER AND SPATIAL STEEL FRAMES
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SEISMIC BEHAVIOUR OF PERIMETER AND SPATIAL STEEL FRAMES

机译：渗透钢和空间钢框架的抗震性能

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The present study deals with the seismic performance of partial perimeter and spatial moment resisting frames (MRFs) for low-to-medium rise buildings. It seeks to establish perimeter configuration systems and hence the lack of redundancy can detrimentally affect the seismic response of framed buildings. The paper tackles this key issue by comparing the performance of a set of perimeter and spatial MRFs, which were "consistently designed". The starting point is the set of low- (three-storey) and medium-rise (nine-storey) perimeter frames designed within the SAC Steel Project for the Los Angeles, Seattle and Boston seismic zones. Extensive design analyses (static and multi-modal) of the perimeter frame buildings and consistent design of spatial frame systems, as an alternative to the perimeter configuration, were conducted within this analytical study. The objectives of the consistent design are two-fold, i.e. obtaining fundamental periods similar to those of the perimeter frames, i.e. same lateral stiffness under design horizontal loads, and supplying similar yield strength. The seismic behaviour of perimeter and spatial configuration structures was evaluated by means of push-over non-linear static analyses and inelastic dynamic analyses (non linear time histories). Comparisons between analysis results were developed in a well defined framework since a clear scheme to define and evaluate relevant limit states is suggested. The failure modes, either local or global, were computed and correlated to design choices, particularly those concerning the strength requirements (column overstrength factors) and stiffness (elastic stability indexes). The inelastic response exhibited by the sample MRFs under severe ground motions was assessed in a detailed fashion. Conclusions are drawn in terms of local and global performance, namely global and inter-storey drifts, beam and column plastic rotations, hysteretic energy. The finding is that the seismic response of perimeter and spatial MRFs is fairly similar. Therefore, an equivalent behaviour between the two configurations can be obtained if the design is "consistent".
机译：本研究研究了中低层建筑的部分周向和抗空间弯矩框架（MRF）的抗震性能。它试图建立外围配置系统，因此缺乏冗余会不利地影响框架式建筑物的地震响应。本文通过比较一组“一致设计”的周界和空间MRF的性能来解决这个关键问题。起点是在SAC钢铁项目中为洛杉矶，西雅图和波士顿地震带设计的一组低（三层）和中层（九层）周边框架。在此分析研究中，对周边框架建筑物进行了广泛的设计分析（静态和多模式），并对空间框架系统进行了一致的设计，以替代周边配置。一致设计的目标是双重的，即获得与周边框架相似的基本周期，即在设计水平载荷下获得相同的横向刚度，并提供相似的屈服强度。通过推覆式非线性静态分析和非弹性动力分析（非线性时间历史）评估了周边和空间构造结构的地震行为。分析结果之间的比较是在定义明确的框架中进行的，因为建议使用明确的方案来定义和评估相关的极限状态。计算了局部或整体的失效模式，并将其与设计选择相关联，特别是与强度要求（列超强度因子）和刚度（弹性稳定性指标）有关的选择。详细评估了在剧烈地面运动下样品MRF表现出的非弹性响应。根据局部和全局性能得出结论，即全局和层间漂移，梁和柱的塑性旋转，滞后能量。发现是周长和空间MRF的地震响应是相当相似的。因此，如果设计是“一致的”，则可以获得两种配置之间的等效行为。

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